וַאֲחֵיהֶ֗ם לְכֹל֙ מִשְׁפְּח֣וֹת יִשָׂשכָ֔ר גִּבּוֹרֵ֖י חֲיָלִ֑ים שְׁמוֹנִ֤ים וְשִׁבְעָה֙ אֶ֔לֶף הִתְיַחְשָׂ֖ם לַכֹּֽל׃ (פ)
Rashi on I Chronicles
And their brethren of all the families both of the sons of Tola, both of the sons of Uzzi, both all David’s mighty warriors were eighty-seven thousand.
Rashi on I Chronicles
all having genealogical records This means: according to all their genealogical records.